Because you like Marta Cabrera in Knives Out
Told her son will one day save the world, Sarah Connor dedicates her life to training him to do just that. See them in The Terminator.
Hanna Marin is a determined girl defined by her ability to transform herself. See them in Pretty Little Liars.
Pro tip: the psych ward is not the best place to find a mentor like Lisa Rowe. See them in Girl, Interrupted.
What Mako Mankanshoku lacks in common sense, she makes up for in sheer optimism and force of personality. See them in Kill la Kill.
Jenna Rink is physically 30 but emotionally 13. She has a better excuse than most. See them in 13 Going on 30.
Eponine is a scrappy street urchin with a bad case of unrequited love. See them in Les Miserables.
Saul Goodman can get just about any lying crook off the hook in court. Well, as long as he can make a buck out of it. See them in Breaking Bad.
Oscar Jarjayes is a sword-swinging, fearless Commander of the Royal Guard who cross-dresses as a man. See them in Rose of Versailles.
A kind and funny valedictorian, Gwen Stacy likes to make out with Spider-man when her homework's done. See them in Marvel Cinematic Universe.
Diana Prince is using a truth-telling lasso and super-strength to make Earth a little more like Paradise. See them in DC Extended Universe.
A few millennia in the mortal realm have caused DEATH to be quite enamored of life. See them in Discworld.